Call of Duty: Ghosts Extinction Trailer

This video offers
another look at the Onslaught DLC for Call of Duty: Ghosts,
focusing on the new extinction mission this will offer when its released for
Xbox LIVE next week and later for other systems (presumably about a month).
Here's the story: "At a remote facility in the Alaskan wilderness, the shadowy
Nightfall Program has been researching the origins of the "Alien" threat. When
the scientists lose control, a small team of elite soldiers must retrieve the
intel, exterminate hordes of hostile creatures, and survive a three-story tall
terror unlike anything they've faced before. Get ready for Episode 1: Nightfall,
the first installment in Extinction's four-part episodic narrative!"